wx.canvasToTempFilePath， 发布的版本安卓手机使用没有任何问题，生成了我们要的带水印的图片。但是苹果手机生成的是空白的图片。 我们尝试了，加计时器，缩小图片大小。都不好使。 wx.canvasToTempFilePath({                             canvas,                             success: (res) => {                                 wx.saveImageToPhotosAlbum({                                     filePath: res.tempFilePath,                                     success: (res) => {                                         wx.showToast({                                             title: '保存成功',                                             icon: 'success',                                             duration: 2000                                         })                                     },                                     fail: (res) => {                                         wx.showToast({                                             title: '保存失败',                                             icon: 'error',                                             duration: 2000                                         })                                     }                                 }) })